solve codescan#53-56

[Liangyx2]

https://github.com/intel/intel-extension-for-transformers/security/code-scanning/56
https://github.com/intel/intel-extension-for-transformers/security/code-scanning/55
https://github.com/intel/intel-extension-for-transformers/security/code-scanning/54
https://github.com/intel/intel-extension-for-transformers/security/code-scanning/53

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 Format Scan Tests workflow

Check ID	Status	Error details
format-scan (pylint)	success		✅
format-scan (bandit)	success		✅
format-scan (cloc)	success		✅
format-scan (cpplint)	success		✅

These checks are required after the changes to intel_extension_for_transformers/neural_chat/models/base_model.py.

🟢 NeuralChat Unit Test

Check ID	Status	Error details
neuralchat-unit-test-baseline	success		✅
neuralchat-unit-test-PR-test	success		✅
Generate-NeuralChat-Report	success		✅

These checks are required after the changes to intel_extension_for_transformers/neural_chat/models/base_model.py.

🟢 Chat Bot Test workflow

Check ID	Status	Error details
call-inference-llama-2-7b-chat-hf / inference test	success		✅
call-inference-mpt-7b-chat / inference test	success		✅

These checks are required after the changes to intel_extension_for_transformers/neural_chat/models/base_model.py.

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Thank you for your contribution! 💜

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